Built for a scattered chess history
ChessSum is an independent chess statistics and learning application for people who play across several accounts. Its central purpose is simple: bring your imported chess history together so you can understand your activity and results without switching between usernames and platforms.
What ChessSum supports
The current sources are Chess.com and Lichess. You can track multiple accounts, explore combined results, replay games and use analysis to identify areas to practice. The current account limit is 10 tracked accounts per member; import coverage and analysis allowances are visible in the app.
Independent, with clear sources
ChessSum is not Chess.com or Lichess and does not replace their accounts or rating systems. Public source usernames identify where records came from. A public player listing is not evidence that the player has joined ChessSum.
How analysis helps
A chess engine evaluates positions. AI explanations can help describe findings in readable language, alongside lessons and practice. These explanations can be imperfect. Check the board and the underlying game examples when following a recommendation.
Understand the numbers
The data guide explains included games, duplicate handling, retained history and platform ratings. Totals can change as imports finish. ChessSum does not invent missing games or present incomplete imports as complete lifetime records.